Collapsible chair



FIG. 1 is a top plan view of a collapsible chair showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view, the right side view being a mirror image thereof; and

FIG. 6 is a perspective view thereof. 

The ornamental design for a collapsible chair, as shown and described. 